THERMODRAIN MODEL SELECTION
Welcome to the ThermoDrain model selection guide. Below you will find information on how to select the right size model drain water heat recovery unit. This is the first step in saving energy, money and getting more out of your water heater.
DRAIN WATER HEAT RECOVERY RESIDENTIAL MODEL SELECTION GUIDE
Always compare length versus efficiency.
Your model selection is quite simple. Three different measurements will determine the model that is best suited for you.
1. MEASURE THE DRAIN SIZE
ThermoDrain comes in 3″, 4″ or 6″ inner drain diameter. Begin by determining your drain size.
2. MEASURE THE LENGTH YOU CAN INSTALL
Measure the maximum vertical length where the ThermoDrain will be installed. Then subtract 2.5″ to allow for the installation of the drain couplings. For example: If you have 45″ of vertical pipe, you can install a 42.5″ long unit (45″-2.5″=42.5″).
3. FIND COLD WATER CONNECTION SIZE
NOTE: THERMODRAIN HAS A 3/4″ A FACTORY INSTALLED PEX OPTION
Standard size is 3/4″. ThermoDrain is available from 1/2″ to 1.5″+
LOOKING FOR METRIC SIZES?
Note: We do offer the ThermoDrain in metric sizes. 110 and 75mm drain diameter x 22mm coil for countries that are currently using metric standard pipe sizes. The drain couplings supplied are also metric compatible.
LOOKING FOR A 2″ DRAIN DIAMETER?
Consider using a 3″ ThermoDrain on a 2″ drain stack if you have no other choice. Verify with local codes. Some areas will allow this due to the simple reason that no solids flow down a 2″ residential drain pipe. The Ontario Building Code 184.108.40.206 allows you to install a larger diameter ThermoDrain on a smaller diameter drain pipe and then return to a smaller diameter under these circumstances.
ALWAYS LOOK AT THE EFFICIENCY OF THE UNIT VERSUS THE LENGTH!
- Always verify the efficiency versus length ratio.
- What is the cost per % efficiency, never calculate cost per inch
- The higher the percent efficiency is per inch, the better the technology and the higher the value
COMMON RESIDENTIAL MODELS
TDH3335B-DR = EXCELLENT VALUE
- 33.5″ long
- 42.1% efficient
- 16.3 lbs
TDH3540B-DR = PERFECT MAX VALUE WITH A 1:1 ON LENGTH vs EFFICIENCY
- 54.0″ long
- 54.0% efficient
- 28.1 lbs
TDH3620B-DR = NETZERO DESIGNED FOR HIGH PERFORMANCE HOMES
- 62.0″ long
- 57.2% efficient
- 32.4 lbs